[time-nuts] DIY FE-5680A lobotomy (disable temp compensation)

Angus not.again at btinternet.com
Thu Jul 3 21:35:41 EDT 2014

Hi Bert,

I am thinking about testing a heat pipe on a fan cooled setup I use.
The first temp controlled chassis I did used a peltier and works very
well, but was a lot more work to do and is much more power hungry. 

The main problem I find is not the temp controller itself, but rather
the change in the temperature across the chassis as the ambient
changes. However good the temp controller is, it only controls a
single point, but other points further away from the sensing
thermistor can vary a lot. 
I noticed you posted a picture of a heat pipe cooler a couple of weeks
ago - did you happen to compare the temperature across the unit with
direct fan cooling and the heat pipe cooler, or with different heat


On Sat, 28 Jun 2014 12:37:37 -0400 (EDT), you wrote:

>Will someone beside us use heat pipe. Would love to have an impendent  
>input. What does it take to get a test going. Scott has done a lot of work, how  
>about some one else step up to the plate. There are a lot of time nuts out 
>there  with the 5680A,many for the first time will have a very good 
>reference and some  of our experts with proper equipment can make a big difference.
>Bert Kehren
>In a message dated 6/28/2014 12:20:12 P.M. Eastern Daylight Time,  
>newell+timenuts at n5tnl.com writes:
>At 04:32  AM 6/28/2014, wb6bnq wrote:
>>monitoring process ?  In other  words have you traced out the 
>>connections to see what is driving the  pin you think is the temperature 
>input ?
>No. I've only traced back from  the ADC input to the voltage divider.
>>The next big question is  have you monitored the frequency and its 
>>stability, externally, to  observe what effects are taking place when 
>>you disable this input to  the A/D ?
>I have not.
>>That sounds complicated and messy  but may be easier than it 
>>appears.  An appropriate container  would be:
>It does sound messy. I don't think I'm willing to dunk one of  my units.

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